bicycle.java

这一些程序都是实验之用

public class Bicycle{
	private Bell bell;
	public Bell getBell() {
		return bell;
	}
}
public void setBell(Bell bell) 
{
	this.bell=bell;
}
public void alert(){
	bell.ring();
}

public class person{
	private Bicycle bicycle;
	public Bicycle getBicycle(){return bicycle;}
	public void setBicycle(Bicycle bicycle){
		this.bicycle=bicycle;
	}
	public void toToWork(){
		bicycle.run();
	}
}